20351232 has 162 divisors, whose sum is σ = 65380406. Its totient is φ = 6082560.

The previous prime is 20351207. The next prime is 20351239. The reversal of 20351232 is 23215302.

It can be written as a sum of positive squares in only one way, i.e., 17842176 + 2509056 = 4224^2 + 1584^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20351239) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 278748 + ... + 278820.

Almost surely, 2^20351232 is an apocalyptic number.

20351232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20351232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32690203).

20351232 is an abundant number, since it is smaller than the sum of its proper divisors (45029174).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20351232 is a wasteful number, since it uses less digits than its factorization.

20351232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 20351232 is about 4511.2339775277. The cubic root of 20351232 is about 273.0215335428.

Adding to 20351232 its reverse (23215302), we get a palindrome (43566534).

The spelling of 20351232 in words is "twenty million, three hundred fifty-one thousand, two hundred thirty-two".